Array state will be cached in iOS 12 Safari. Is it a bug or feature?

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Update at 2018.10.31

This bug has been fixed in iOS 12.1, have a good day~

I found a problem with Array’s value state in the newly released iOS 12 Safari, for example, code like this:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <title>iOS 12 Safari bugs</title>
    <script type="text/javascript">
    window.addEventListener("load", function ()
    {
        let arr = [1, 2, 3, 4, 5];
        alert(arr.join());

        document.querySelector("button").addEventListener("click", function ()
        {
            arr.reverse();
        });
    });
    </script>
</head>
<body>
    <button>Array.reverse()</button>
    <p style="color:red;">test: click button and refresh page, code:</p>
</body>
</html>

After refreshing the page, the array’s value is still reversed. Is this a bug or a feature of new Safari?

Here is a demo page. Try to use it with iOS 12 Safari:
https://abelyao.github.io/others/ios12-safari-bug.html

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